<template>
    <div class="app-container">
        <h2 style="text-align: center;">发布新课程</h2>
        <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
            <el-step title="填写课程基本信息"/>
            <el-step title="创建课程大纲"/>
            <el-step title="最终发布"/>
        </el-steps>

        <el-button type="text" @click="openChapterDialog()">添加章节</el-button>
        <!-- 章节 -->
        <ul class="chanpterList">
            <li
                v-for="chapter in chapterVideoList"
                :key="chapter.id">
                <p>
                    {{ chapter.title }}

                    <span class="acts">
                        <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                        <el-button style="" type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                        <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                    </span>
                </p>

                <!-- 视频 -->
                <ul class="chanpterList videoList">
                    <li
                        v-for="video in chapter.children"
                        :key="video.id">
                        <p>
                            {{ video.title }}

                        <span class="acts">
                            <el-button style="" type="text" @click="openEditVideo(video.id)">编辑</el-button>
                            <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                        </span>
                        </p>
                    </li>
                </ul>
            </li>
        </ul>
        <div>
            <el-button @click="previous">上一步</el-button>
            <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
        </div>

        <!-- 添加和修改章节表单 -->
        <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
            <el-form :model="chapter" label-width="120px">
                <el-form-item label="章节标题">
                    <el-input v-model="chapter.title"/>
                </el-form-item>
                <el-form-item label="章节排序">
                    <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
                </el-form-item>
            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
                <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
            </div>
        </el-dialog>

        <!-- 添加和修改课时表单 -->
        <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
            <el-form :model="video" label-width="120px">
                <el-form-item label="课时标题">
                    <el-input v-model="video.title"/>
                </el-form-item>
                <el-form-item label="课时排序">
                    <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
                </el-form-item>
                <el-form-item label="是否免费">
                <el-radio-group v-model="video.isFree">
                    <el-radio :label="true">免费</el-radio>
                    <el-radio :label="false">默认</el-radio>
                </el-radio-group>
                </el-form-item>

                <el-form-item label="上传视频">
                    <!--
                    自动上传
                    :on-success     上传成功
                    :on-remove      删除，点击确认调用这个方法
                    :before-remove  删除之前,点击x调用这个方法
                    :on-exceed      上传之前
                    :file-list      文件列表也就是显示在文件下面的内容
                    :action         请求的后端接口地址
                    :limit          允许上传文件数量
                      -->
                    <el-upload
                        :on-success="handleVodUploadSuccess"
                        :on-remove="handleVodRemove"
                        :before-remove="beforeVodRemove"
                        :on-exceed="handleUploadExceed"
                        :file-list="fileList"
                        :action="BASE_API+'/eduvod/video/uploadAlyVideo'"
                        :limit="1"
                        class="upload-demo">
                    <el-button size="small" type="primary">上传视频</el-button>
                    <el-tooltip placement="right-end">
                        <div slot="content">最大支持1G，<br>
                            支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                            GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                            MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                            SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                        <i class="el-icon-question"/>
                    </el-tooltip>
                    </el-upload>
                </el-form-item>

            </el-form>
            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
                <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
            </div>
        </el-dialog>


    </div>
</template>

<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'

export default {
    data() {
        return {
            saveBtnDisabled:false,   //下一步按钮是否禁用
            courseId:'',//课程id
            chapterVideoList:[],
            chapter:{ // 封装章节数据
                title: '',
                sort: 0
            },
            video:{
                title: '',
                sort: 0,
                isFree: 0,
                videoSourceId: '',
                videoOriginalName:''//视频名称
            },
            dialogChapterFormVisible:false,//章节弹框
            dialogVideoFormVisible:false, //小节弹框

            fileList: [],//上传文件列表
            BASE_API: process.env.BASE_API // 接口API地址
        }
    },
    created() {
        //获取路由的id值
        if(this.$route.params && this.$route.params.id){
            this.courseId = this.$route.params.id
            //根据课程id查询章节和小节
            this.getChapterVideo()
        }
        
    },
    methods: {
        //点击确定调用的方法
        handleVodRemove(){
            //调用接口的删除视频的方法
            video.deleteAliyunvod(this.video.videoSourceId)
                .then(reponse => {
                    //提示信息
                    this.$message({
                        type: 'success',
                        message: '删除视频成功!'
                    });
                    //把文件列表清空
                    this.fileList = []
                    //把video视频id和视频名称值清空
                    //把上传视频id赋值
                    this.video.videoSourceId = ''
                    //上传视频名称赋值
                    this.video.videoOriginalName = ''
                })

        },

        //点击x调用这个方法
        beforeVodRemove(file,fileList){
            return this.$confirm(`确定移除 ${ file.name }？`);
        },

        //上传视频成功调用的方法
        handleVodUploadSuccess(response, file, fileList){ //file表示当前上传的文件
            //把上传视频id赋值
            this.video.videoSourceId = response.data.videoId
            //上传视频名称赋值
            this.video.videoOriginalName = file.name
        },
        
        //上传视频之前
        handleUploadExceed(){
           this.$message.warning('想要重新上传视频，请先删除已上传的视频') 
        },
//=========================小节操作=================================

        //修改小节弹框数据回显
        openEditVideo(videoId){
            //弹框
            this.dialogVideoFormVisible = true
            //调用接口
            video.getVideo(videoId)
                .then(response => {
                    this.video = response.data.video
                })
        },

        //修改小节的方法
        updateVideo(){
            video.updateVideo(this.video)
                .then(response => {
                    //关闭弹框
                    this.dialogVideoFormVisible = false
                    //提示
                    this.$message({
                        type: 'success',
                        message: '修改小节成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
        },

        //删除小节
        removeVideo(videoId){
            this.$confirm('此操作将删除小节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => { //点击确定，执行then方法
                //调用删除的方法
                video.deleteVideo(videoId)
                    .then(response => {//删除成功
                    //提示信息
                    this.$message({
                        type: 'success',
                        message: '删除小节成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
            }) //点击取消，执行catch方法
        },

        //添加小节弹框的方法
        openVideo(chapterId){
            //弹框
            this.dialogVideoFormVisible = true
            //设置章节id
            this.video.chapterId = chapterId


            //表单数据清空
            this.video.title = ''
            this.video.sort = 0
            this.video.isFree = 0
            this.video.videoSourceId = ''
            this.fileList = []

        },

        //添加小节
        addVideo(){
            //设置课程id
            this.video.courseId = this.courseId
            video.addVideo(this.video)
                .then(response => {
                    //关闭弹框
                    this.dialogVideoFormVisible = false
                    //提示
                    this.$message({
                        type: 'success',
                        message: '添加小节成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        saveOrUpdateVideo(){
            if(!this.video.id){
                this.addVideo()
            }else{
                this.updateVideo()
            }
        },



//=========================章节操作=================================
        //删除章节
        removeChapter(chapterId){
            this.$confirm('此操作将删除章节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => { //点击确定，执行then方法
                //调用删除的方法
                chapter.deleteChapter(chapterId)
                    .then(response => {//删除成功
                    //提示信息
                    this.$message({
                        type: 'success',
                        message: '删除章节成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
            }) //点击取消，执行catch方法
        },
        //修改章节弹框数据回显
        openEditChapter(chapterId){
            //弹框
            this.dialogChapterFormVisible = true
            //调用接口
            chapter.getChapter(chapterId)
                .then(response => {
                    this.chapter = response.data.chapter
                })
        },
        //弹出添加章节页面
        openChapterDialog(){
            //弹框
            this.dialogChapterFormVisible = true
            //表单数据清空
            this.chapter.title = ''
            this.chapter.sort = 0
        },
        //添加章节
        addChapter(){
            //设置课程id到chapter对象里面
            this.chapter.courseId = this.courseId
            chapter.addChapter(this.chapter)
                .then(response => {
                    //关闭弹框
                    this.dialogChapterFormVisible = false
                    //提示
                    this.$message({
                        type: 'success',
                        message: '添加章节成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        //修改章节的方法
        updateChapter(){
            chapter.updateChapter(this.chapter)
                .then(response => {
                    //关闭弹框
                    this.dialogChapterFormVisible = false
                    //提示
                    this.$message({
                        type: 'success',
                        message: '修改章节成功!'
                    });
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        saveOrUpdate(){
            if(!this.chapter.id){
                this.addChapter()
            }else{
                this.updateChapter()
            }
        },
        //根据课程id查询章节和小节
        getChapterVideo(){
            chapter.getAllChapterVideo(this.courseId)
                .then(response => {
                    this.chapterVideoList = response.data.allChapterVideo
                })
        },
        previous(){
            //跳转到上一步
            this.$router.push({path:'/course/info/' + this.courseId})
        },
        next(){
            //跳转到第二步
            this.$router.push({path:'/course/publish/' + this.courseId})
        }    
    },
}
</script>
<style scoped>
    .chanpterList{
        position: relative;
        list-style: none;
        margin: 0;
        padding: 0;
    }

    .chanpterList li{
        position: relative;
    }

    .chanpterList p{
        float: left;
        font-size: 20px;
        margin: 10px 0;
        padding: 10px;
        height: 70px;
        line-height: 50px;
        width: 100%;
        border: 1px solid #DDD;
    }
    
    .chanpterList .acts {
        float: right;
        font-size: 14px;
    }

    .videoList{
        padding-left: 50px;
    }

    .videoList p{
        float: left;
        font-size: 14px;
        margin: 10px 0;
        padding: 10px;
        height: 50px;
        line-height: 30px;
        width: 100%;
        border: 1px dotted #DDD;
    }
</style>